Put SVGResourceContainer subtypes into their own property trees.

third_party/WebKit/Source/core/paint/PaintInvalidator.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PaintInvalidator_h
 #define PaintInvalidator_h
 
 #include "platform/geometry/LayoutRect.h"
 #include "platform/graphics/paint/GeometryMapper.h"
 #include "wtf/Vector.h"
@@ skipping 36 matching lines @@
 
   enum ForcedSubtreeInvalidationFlag {
     ForcedSubtreeInvalidationChecking = 1 << 0,
     ForcedSubtreeInvalidationRectUpdate = 1 << 1,
     ForcedSubtreeFullInvalidation = 1 << 2,
     ForcedSubtreeFullInvalidationForStackedContents = 1 << 3,
     ForcedSubtreeSVGResourceChange = 1 << 4,
     // TODO(crbug.com/637313): This is temporary before we support filters in
     // paint property tree.
     ForcedSubtreeSlowPathRect = 1 << 5,
+
+    // The paint invalidation tree walk invalidates paint caches, such as
+    // DisplayItemClients and subsequence caches, and also the regions
+    // into which objects raster pixels. When this flag is set, raster region
+    // invalidations are not issued.
+    //
+    // Context: some objects in this paint walk, for example SVG resource
+    // container subtress, don't actually have any raster regions, because they
+    // are used as "painting subroutines" for one or more other locations in
+    // SVG.
+    ForcedSubtreeNoRasterInvalidation = 1 << 6,
   };
   unsigned forcedSubtreeInvalidationFlags = 0;
 
   // The following fields can be null only before
   // PaintInvalidator::updateContext().
 
   // The current paint invalidation container for normal flow objects.
   // It is the enclosing composited object.
   const LayoutBoxModelObject* paintInvalidationContainer = nullptr;
 
@@ skipping 55 matching lines @@
                                                       PaintInvalidatorContext&);
   ALWAYS_INLINE void updateVisualRect(const LayoutObject&,
                                       PaintInvalidatorContext&);
 
   Vector<const LayoutObject*> m_pendingDelayedPaintInvalidations;
 };
 
 }  // namespace blink
 
 #endif  // PaintInvalidator_h